[jira] [Created] (HIVE-5825) Case statement type checking too restrictive for parameterized types

["Jason Dere (JIRA)" <ji...@apache.org>]

Jason Dere created HIVE-5825:
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             Summary: Case statement type checking too restrictive for parameterized types
                 Key: HIVE-5825
                 URL: https://issues.apache.org/jira/browse/HIVE-5825
             Project: Hive
          Issue Type: Bug
          Components: UDF
            Reporter: Jason Dere
            Assignee: Jason Dere


explain select
  case when (key = '0') then 123.456BD else 0.0BD end
from src limit 2

FAILED: SemanticException [Error 10016]: Line 3:44 Argument type mismatch '0.0BD': The expression after ELSE should have the same type as those after THEN: "decimal(6,3)" is expected but "decimal(1,0)" is found

The return type checking is too strict and won't allow different decimal types to be returned if they are not the exact same type (precision/scale).  There are similar issues with char/varchar length, but even in the general case it seems odd that you wouldn't be able to specify 1 and 0.0 in the same case statement.

I would propose setting returnOIResolver so that it is able to convert the return values to common type.



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